Petetts



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W. B. S RD. METHOD OF MAKING E METAL PIPE- No. 410,293. atented Sept. 3,1889.

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W .B SANDPORD A METHOD OF MAKING SQUARE METAL PIPE.

No. 410,203. Patented Sept.'3, 1889 N: PETERS, Moljlhnllggflbr.Wahinpoo. D. C.

UNITED STATES PAT NT OFFICE.

\VILLIAM B. SANDFORD, OF KEWANEE, ILLINOIS,'ASSIGNOR TO THE HAXTUN STEAMHEATER COMPANY, OF SAME PLACE.

SQUARE METAL PIPE.

SPECIFICATION forming part of LettersPatent No. 410,203, dated September3, 1889.

Application filed July 23,1889. Serial No. 318,423. (No model.) i

To all whom it may concern:

Be it known that 1, WILLIAM B. SANDFORD, residing at Kewanee, in thecounty of Henry and State of Illinois, and a citizen of the 5 UnitedStates, have invented a new and useful Improvement in the Method ofManufacturing Square Metal Pipe from Round Pipe, of which the followingis a specification, reference being had to the accompanying drawings, inwhich- Figure 1 is a vertical section through a portion of two rolls,taken at their contact-points, showing the form of the grooves in theperipheries of the two rolls. Fig. 2 is a view r5 the same as that shownin Fig. 1,except that the form of the groove is different. In Figs. 1and 2 the faces'and sides of each groove are concave. Fig. 3 is asection like that shown in Fig. 1, the grooves in the faces of the rollsbeing angular. Fig. trepresents two pairs of rolls mounted in a singleframe.

Letters Patent of the United States No. 368,622 were granted to meAugust 23, 1887, for improvement in the manufacture of square metalpipe, in which patent I showed and described devices for manufacturingsquare metal pipe from round pipe without the use of a mandrel or otherinterior support, the leadingfeature in such patentbeing beILshapeddies, substantially rectangular in cross-section 011 the inside andhaving their acting faces more or less concaved. According to saidpatent, square pipe could be made by drawing round pipe through suchdies.

The object of my present invention is to provide an improved method ofmanufacturing square metal pipe from round pipe without the use of amandrel or other interior support,which I accomplish bypassing roundpipe through rolls, each roll provided with a groove in its face, thesides of each groove being concave instead of straight. To bring thepipe to its most perfect form, I pass the pipe through finishing-rolls,which are provided with grooves in their faces, the sides of whichgrooves are straight. I have illustrated in the accompanying drawings machinery and rolls having forms adapted to do this work.

That which I claim as new will be pointed out in the claim.

In the drawings, A represents a roll made of metal, as is usual.

B is a groove in the periphery or face of the'roll A. The two sidesct aare each some what concaved, as shown in the drawings.

C is another roll similar to the roll A. It is provided with a groove Din its periphery or face, and the sides I) b of this groove areconcaved, the same as the sides a a of the roll A. These rolls A O areto be of any suitable size, and are to be mounted in a strong frame andmay be driven by cog-wheels in the usual manner.

E F are two other rolls similar to rolls A C, 6 5 except that the sidesof the grooves in these two rolls E F are concaved less than are thesides of the grooves in the rolls A (5. These rolls E F are also to bemounted in a strong frame and may be driven in any suitable 7o manner.

A convenient way to arrange the rolls is-to place the two A 0 upon o'fieside and E F upon the opposite side of the same frame, as shown in Fig.4. I

In manufacturing square pipe from round pipeby the use of these rollsthe pipe is to be first suitably heated in a furnace, and each piece isthen to be passed first between the rolls A G, the movement of the rollsforcing the pipe through them. After apiece of pipe has been passedthrough the rolls A C it is to be passed through the rolls E F, thegrooves in the faces of which are less concave than those in the rolls AC, and when the pipe leaves the rolls E F it will be nearly, if notquite, square. However, to bring the pipe to its most perfect form, Iuse finishingrolls G H, which are provided with grooves in their faces,the sides of which grooves are 0 straight, the grooves being so formedthat when the two rolls are together the two grooves form an exactsquare. The finishing-rolls G H may be mounted in a separate frame anddriven in the usual manner. A straightening-die may be used similar tothat shown in Fig. at of my said former patent, the object of which isnot to aid in giving the pipe its square form, but to prevent it fromtwisting. The pipe may be delivered into a trough after too it passesthrough the straightening-die, as shown in my former patent. In Fig. 4,a rep resents a piece of pipe, and b a trough in which the pipe isdelivered. The concave form of the faces of the grooves in these rolls AO and EF is very important, and without this form square pipe could notbe made from round pipe by the use of the rolls, because if the faces ofthe grooves were straight the metal in the pipe would buckle inwardwhile passing between the rolls, and it would then be impracticable tobring the interior of the pipe to a substantially square form.

I am able to manufacture square pipe from round pipe without the use ofa mandrel or other interior support, by means of rolls having groovesthe faces of which are concave, much inore rapidly than by the use ofthe dies described in my former patent. The

pipecan be forced between the rolls by their movement, and can be passedbetween two or three sets of rolls without being reheated, while whenthe dies are used the pipe should be reheated after havingbeen drawnthrough one diebefore being drawn through another.

In Figs. 1, 2, and 3 the rolls are full size for the manufacture of pipetwo inches square.

In Fig. 4 I have not shown straighteningdies; but they may be supportedin any suitable manner, and should be located so as to receive thepipeas it passes from the rolls, substantially as shown in my formerpatent.

What I claim as new, and desire to secure by Letters Patent, is asfollows:

The mode of making square tubes from round tubes,which consists inpassing a round tube, unsupported internally, through rolls, which, bytheir impact upon said round tube,

will gradually mold the tube into a square form, substantially asdescribed.

\VILLIAM B. SANDFORD. Witnesses:

JOH H. PIERCE, RoBr'BUNcE.

